1. Refine the error handling when the PXE-v4 DHCP offer isn't valid

Signed-off-by: hhuan13
Reviewed-by: xdu2

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12192 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c

@@ -388,6 +388,8 @@ EfiPxeBcDhcp (
   Mode->IcmpErrorReceived = FALSE;
   Private->Function       = EFI_PXE_BASE_CODE_FUNCTION_DHCP;
   Private->IsOfferSorted  = SortOffers;
+  Private->SolicitTimes   = 0;
+  Private->ElapsedTime    = 0;
 
   if (!Mode->Started) {
     return EFI_NOT_STARTED;